LM73CIMK-0/NOPB HVAC Temperature Sensors Board Mount Temperature Sensors Digital Ts W/Smbus Interface

1 Features

• Single Address Pin Offers Choice of Three Selectable Addresses Per Version for a Total of Six Possible Addresses.

• SMBus and I2C-compatible Two-Wire Interface

• Supports 400-Khz Operation

• Shutdown Mode With One-shot Feature Available for Very Low Average Power Consumption

• Programmable Digital Temperature Resolution From 11 Bits to 14 Bits

• Fast Conversion Rate Ideal for Quick Power Up and Measuring Rapidly Changing Temperature

• Open-Drain ALERT Output Pin Goes Active When Temperature is Above a Programmed Temperature Limit

• Very Stable, Low-noise Digital Output

• UL Recognized Component

• Key Specifications

  • – Supply Current

    • – Operating

      • – 320 μA (Typical)

      • – 495 μA (Maximum)

    • – Shutdown

      • – 8 μA (Maximum)

      • – 1.9 μA (Typical)

  • – Temperature Accuracy

    • – −10°C to 80°C: ±1.0°C (Maximum)

    • – −25°C to 115°C: ±1.5°C (Maximum)

    • – −40°C to 150°C: ±2°C (Maximum)

  • – Resolution

– 0.25°C to 0.03125°C

– Conversion Time

• – 11-Bit (0.25°C): 14 ms (Maximum)

• – 14-Bit (0.03125°C): 112 ms (Maximum)

2 Applications

• Portable Electronics

• Notebook Computers

• Automotive

• System Thermal Management

• Office Electronics

3 Description

The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I2C interfaces. The host can query the LM73 at any time to read temperature.

Available in a 6-pin SOT package, the LM73 occupies very little board area while operating over a wide temperature range (–40°C to 150°C) and providing ±1°C accuracy from –10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in temperature.

A single multi-level address line selects one of three unique device addresses. An open-drain ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable communication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention.

Device Information